Out of the 17 operating systems tested, only Android 7.0 “Nougat”, macOS 10.12.1 “Sierra”, and OpenBSD 6.0 (Unix) had completely secure stack canaries. A red cross means that it is possible to bypass the stack canary in the given combination. An orange cross mean that stack canary security can be improved. Table columns are different memory types from a programming logic standpoint.